/**
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */
import { cloneDeep } from 'lodash';

function processObject(object: Object) {
  const result = object;
  Object.keys(result).forEach(key => {
    if (result[key] === undefined) {
      result[key] = null;
    } else if (result[key] !== null && typeof result[key] === 'object') {
      result[key] = processObject(result[key]);
    }
  });
  return result;
}

export default function replaceUndefinedByNull(object: Object) {
  const copy = cloneDeep(object);
  return processObject(copy);
}
